wow! a TC-Contender!
now that's a gun! I remember vaguely that, when they went first on sale in Germany(have forgotten when that was - sometime in the 60's I'm sure) I wanted one! but could not afford it. One of the attractive parts was the ability to change calibers.
They were expensive then - what are they now? (are they still made? - I somehow don't think so)
Difficult to shoot off-hand though, I should think - weight alone..

Sorry, but this took me back some 50 years....

rgds
Gunter